Response Functions of Masson Pine Provenances to Different Environment and Suitable Range for Superior Provenances

The set of 9yearoldheight data of 24 provenances of masson pine (Pinus massoniana Lamb,) from 9 regional trial locations with good growth was used to establish height response function for each provenance grown at different latitudes.It was observed that three response function parameters including mode latitude,homeostatic parameter and scale parameter were strongly related to provenance latitude.For the northern seed sources, mode latitudes were more than 3o～6o below latitudes of origin,whereas the southern seed sources attained best growth at latitudes near their origin.In general,larger estimate for a homeostatic parameter and scale parameter was obtained for the southern seed source,compared with the northern seed source.The sounthern provenances were less sensitive to environmental changes if planted over good sites.Considered the vigours in height growth of various provenances extended in different latitudes and the safe factors in seed transfer,the range of suitable planting site was determined for several famous superior provenances of masson pine.